Official data from INPI

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ConcedidaInvention Patent

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Application data

Number

PI7406026

Type

Invention Patent

Filing

07/22/1974

Publication

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Progress at the INPI

Filing07/22/74
Publication
Examination
Allowance
Grant12/02/80
Expired11/17/92

The letters patent expired on 11/17/1992: the term of protection has ended. The technology is in the public domain and may be freely used in Brazil.

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Latest action published by the INPI: 12/02/1980. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Gosudarstvenny Vesesojuzny Institut po P. P. K. Promyshlennsti (Giprokox)

Inventors

E. B. (pessoa física)

Technical data

IPC Classification

C10B 39/02

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

12/02/1980

RPI 528

Carta-patente expirada

#21.1

11/17/1992

RPI 1146

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